Package org.apache.curator.framework

Examples of org.apache.curator.framework.CuratorFramework

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    public void     testBackgroundGetDataWithWatch() throws Exception
    {
        final byte[]        data1 = {1, 2, 3};
        final byte[]        data2 = {4, 5, 6, 7};

        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
        try
        {
            final CountDownLatch          watchedLatch = new CountDownLatch(1);
            client.getCuratorListenable().addListener
            (
                new CuratorListener()
                {
                    @Override
                    public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception
                    {
                        if ( event.getType() == CuratorEventType.GET_DATA )
                        {
                            Assert.assertEquals(event.getPath(), "/test");
                            Assert.assertEquals(event.getData(), data1);
                            ((CountDownLatch)event.getContext()).countDown();
                        }
                        else if ( event.getType() == CuratorEventType.WATCHED )
                        {
                            if ( event.getWatchedEvent().getType() == Watcher.Event.EventType.NodeDataChanged )
                            {
                                Assert.assertEquals(event.getPath(), "/test");
                                watchedLatch.countDown();
                            }
                        }
                    }
                }
            );

            client.create().forPath("/test", data1);

            CountDownLatch      backgroundLatch = new CountDownLatch(1);
            client.getData().watched().inBackground(backgroundLatch).forPath("/test");
            Assert.assertTrue(backgroundLatch.await(10, TimeUnit.SECONDS));

            client.setData().forPath("/test", data2);
            Assert.assertTrue(watchedLatch.await(10, TimeUnit.SECONDS));
            byte[]      checkData = client.getData().forPath("/test");
            Assert.assertEquals(checkData, data2);
        }
        finally
        {
            client.close();
        }
    }
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    }

    @Test
    public void     testBackgroundCreate() throws Exception
    {
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
        try
        {
            client.getCuratorListenable().addListener
            (
                new CuratorListener()
                {
                    @Override
                    public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception
                    {
                        if ( event.getType() == CuratorEventType.CREATE )
                        {
                            Assert.assertEquals(event.getPath(), "/test");
                            ((CountDownLatch)event.getContext()).countDown();
                        }
                    }
                }
            );

            CountDownLatch     latch = new CountDownLatch(1);
            client.create().inBackground(latch).forPath("/test", new byte[]{1, 2, 3});
            Assert.assertTrue(latch.await(10, TimeUnit.SECONDS));
        }
        finally
        {
            client.close();
        }
    }
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    }

    @Test
    public void     testCreateModes() throws Exception
    {
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
        try
        {
            byte[]  writtenBytes = {1, 2, 3};
            client.create().forPath("/test", writtenBytes); // should be persistent

            client.close();
            client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
            client.start();

            byte[]  readBytes = client.getData().forPath("/test");
            Assert.assertEquals(writtenBytes, readBytes);

            client.create().withMode(CreateMode.EPHEMERAL).forPath("/ghost", writtenBytes);

            client.close();
            client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
            client.start();

            readBytes = client.getData().forPath("/test");
            Assert.assertEquals(writtenBytes, readBytes);
            Stat    stat = client.checkExists().forPath("/ghost");
            Assert.assertNull(stat);

            String  realPath = client.create().withMode(CreateMode.PERSISTENT_SEQUENTIAL).forPath("/pseq", writtenBytes);
            Assert.assertNotSame(realPath, "/pseq");

            client.close();
            client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
            client.start();

            readBytes = client.getData().forPath(realPath);
            Assert.assertEquals(writtenBytes, readBytes);

            realPath = client.create().withMode(CreateMode.EPHEMERAL_SEQUENTIAL).forPath("/eseq", writtenBytes);
            Assert.assertNotSame(realPath, "/eseq");

            client.close();
            client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
            client.start();

            stat = client.checkExists().forPath(realPath);
            Assert.assertNull(stat);
        }
        finally
        {
            client.close();
        }
    }
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    }

    @Test
    public void     testSimple() throws Exception
    {
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), new RetryOneTime(1));
        client.start();
        try
        {
            String    path = client.create().withMode(CreateMode.PERSISTENT).forPath("/test", new byte[]{1, 2, 3});
            Assert.assertEquals(path, "/test");
        }
        finally
        {
            client.close();
        }
    }
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    {
        final int SLEEP = 1000;
        final int TIMES = 5;

        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryNTimes(TIMES, SLEEP));
        try
        {
            client.start();
            client.getZookeeperClient().blockUntilConnectedOrTimedOut();

            final CountDownLatch latch = new CountDownLatch(TIMES);
            final List<Long> times = Lists.newArrayList();
            final AtomicLong start = new AtomicLong(System.currentTimeMillis());
            ((CuratorFrameworkImpl)client).debugListener = new CuratorFrameworkImpl.DebugBackgroundListener()
            {
                @Override
                public void listen(OperationAndData<?> data)
                {
                    if ( data.getOperation().getClass().getName().contains("CreateBuilderImpl") )
                    {
                        long now = System.currentTimeMillis();
                        times.add(now - start.get());
                        start.set(now);
                        latch.countDown();
                    }
                }
            };

            server.stop();
            client.create().inBackground().forPath("/one");

            latch.await();

            for ( long elapsed : times.subList(1, times.size()) )   // first one isn't a retry
            {
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    @Test
    public void testBasic() throws Exception
    {
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try
        {
            client.start();

            final CountDownLatch latch = new CountDownLatch(3);
            final List<String> paths = Lists.newArrayList();
            BackgroundCallback callback = new BackgroundCallback()
            {
                @Override
                public void processResult(CuratorFramework client, CuratorEvent event) throws Exception
                {
                    paths.add(event.getPath());
                    latch.countDown();
                }
            };
            client.create().inBackground(callback).forPath("/one");
            client.create().inBackground(callback).forPath("/one/two");
            client.create().inBackground(callback).forPath("/one/two/three");

            latch.await();

            Assert.assertEquals(paths, Arrays.asList("/one", "/one/two", "/one/two/three"));
        }
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     */
    @Test
    public void testCuratorCallbackOnError() throws Exception
    {

        CuratorFramework client = CuratorFrameworkFactory.builder()
            .connectString(server.getConnectString())
            .sessionTimeoutMs(60000)
            .retryPolicy(new RetryNTimes(1, 1000)).build();
        final CountDownLatch latch = new CountDownLatch(1);
        try
        {
            client.start();
            BackgroundCallback curatorCallback = new BackgroundCallback()
            {

                @Override
                public void processResult(CuratorFramework client, CuratorEvent event)
                    throws Exception
                {
                    if ( event.getResultCode() == Code.CONNECTIONLOSS.intValue() )
                    {
                        latch.countDown();
                    }
                }
            };
            // Stop the Zookeeper server
            server.stop();
            // Attempt to retrieve children list
            client.getChildren().inBackground(curatorCallback).forPath("/");
            // Check if the callback has been called with a correct return code
            Assert.assertTrue(latch.await(10, TimeUnit.SECONDS), "Callback has not been called by curator !");
        }
        finally
        {
            client.close();
        }

    }
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  }

  @Override
  protected FlumeConfiguration getFlumeConfiguration() {
    try {
      CuratorFramework cf = createClient();
      cf.start();
      try {
        byte[] data = cf.getData().forPath(basePath + "/" + getAgentName());
        return configFromBytes(data);
      } finally {
        cf.close();
      }
    } catch (Exception e) {
      LOGGER.error("Error getting configuration info from Zookeeper", e);
      throw new FlumeException(e);
    }
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    }

    @Test
    public void testShouldTrace() throws Exception {

        final CuratorFramework zkCurator = traceFilter.getZkCurator();
        assertFalse("znode does not exist.", traceFilter.trace(null));
        zkCurator.create().creatingParentsIfNeeded().forPath(SAMPLE_RATE_NODE, new String("1").getBytes());
        Thread.sleep(100);
        assertTrue(traceFilter.trace(null));
        assertTrue(traceFilter.trace(null));
        assertTrue(traceFilter.trace(null));
        setValue(zkCurator, 0);
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        setValue(zkCurator, 3);
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        assertTrue(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        assertTrue(traceFilter.trace(null));
        setValue(zkCurator, -1);
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        zkCurator.delete().forPath(SAMPLE_RATE_NODE);
        Thread.sleep(100);
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
        assertFalse(traceFilter.trace(null));
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            retryPolicy = new ExponentialBackoffRetry(1000, 3);
        }

        @Override
        public CuratorFramework get() {
            CuratorFramework client = CuratorFrameworkFactory.newClient(zookeeperConnectionString, retryPolicy);
            client.start();
            return client;
        }
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